I am sorry to hear you are having issues with your Bluetooth after the update. I know those kind of issues can be very frustrating.

We have had other complaints regarding the same issue and now have our Technical team actively working on a resolution. We hope to have a fix once we identify the exact problem and will send it to everyone once it is found.

One simple step that has been reported as fixing the issue from some of our customers is:

Turn on Airplane mode for 3-5 seconds, then shut it off again. This acts as a modem reset.

Another option if you are comfortable completing it, is to revert back to the January update until a fix is created which may not get pushed out until the March 2019 update.